A half-bowl of ground up marijuana mixed with pipe tobacco and inserted into the bowl of a bong. The prospective stonee will snap the bowl, pushing it down with his finger and alternating between hard and soft hitting until the everything is smoked and the ash is all sucked into the water, at which point he will clear the bong. The tobacco will give on the spins upon clearing the chamber, and hitting the weed in this manner gets you very fucked up.

Stoner 1: Holy shit bro, that fourth snap just kicked my ass, I'm not even sure if I can still walk.
Stoner 2: I know man, my head's still spinnin' from that last molar.